[4910-13-PI

DEPARTM ENT OF T~SPORTA nON

Federal Aviation Administration

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J 4 CFR Part 39 ·20 \ I - C C:.- ":')

IOocket No. FAA-2&tft.: I I 1I I ; Directorate Identifier 2009-Nl\1-228-ADI

RIN 2120-AA64

Airwortbiness Directives; The Boeing Company Model 737·100, ~200, -200C, -300,

-400, and -500 Series Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPR.i\1).

SUMMARY: We propose to adopt a new airworthiness di.rective (AD) for cenain Mod

73 7-100, -200, -200e, -300, -400, and -500 series airplanes. This proposed AD would

result in all airplanes having new relays with a ground fault interrupter (GFl) feature_

This proposed AD would require, depending on airplane confi&'uration, doing certain

wiring changes, replacing the fuel pump power control rclays far the main, center and

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AD also would require revising the maintenance program to incorponlle airworthiness ';'; u-y'1-(

auxiliary tanks, as applicablc, with new relays having a GPI feature, perfamling certain

bonding resistance mcasurements, and modifying relay module assemblies. The propos

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consequent loss of the airplane.

DAYS AFTER DATE OF PUBLICATION [N TKE FEDERAL REGISTER].

airplanes). This proposed.W results from fuel system reviews conducted by {he

limitations (AWLs) No. 28-A WL-23 (for Model 737-100, 737-200, and 737-200C sene '~:~

airplanes), and No. 28-A WL-22 (for Model 737-300, 737-400, and 737-500 series 'N"',"5r~l<;

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manufacturer. \Ve are proposing this AD 10 prevent damage to the fuel pumps caused b... """m:.Sy

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electrical arcing that could intTOduce an ignition source in the fuel tauk, which, in :" ~'sr~

combinalion with flammable fuel vapors, could result in a fuel tank explosion and

DATES: We must receive comments on this proposed AD by [INSERT DATE 4S
14910-13-PI

DEPARTMENT OF TRANSPORTA nON

Federal Aviation Administration

J 4 CFR Part 39

:ot<rl,l~<:l;'<U,

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B:llit1I'L.

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mocket No. FAA-201O-+++++; Directorate Identifier 2009-NM-228-ADI

RIN 2120-.0\..'\64

Airworthiness Directives; The Boeing Company Model 737-100, -200, -lODe, -300,

-400, and -500 Series Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rolel11aking (i'\rpRI\if).

SUMMARY: We propose to adopt a new airworthiness directive (AD) for cenain Mod

737-100, -200, -200e, -300. -400, and -500 series airplanes. This proposed AD would

result in all airplanes having new rclays with a ground fault intenuptcr (GFf) feature.

This proposed AD would require, depending on airplane configuration, doing certain

~

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manufacturer. We are proposing this AD to prevent damage to the fuel pumps caused b~ -o.m,,,"S'14IIOI.

airplanes). This proposed AD results from fuel system reviews conducted by the

bonding resistance measurements, and modifying relay module assemblies. The propos

AD also would require revising the- maintenance program to incorporate airworthiness ;~llqlIO

limilalions (AWLs) No. 28-A WL-23 (For Model 737-100, 737-200, and 737-200C serie ~:·\lt.f

airplanes), and No. 28·A WL-22 (for Model 737-300, 737-400, and 737.500 series ""noes/s'G

wiring changes, replacing the fuel pump power control relays for the main, center and bf'

auxiliary tanks, as applicable, with new relays having a GFI feature, performing certain

electrical arcing that could introduce an ignition source in the fuel tank, which. in ...,~"

combination \vith flammable fuel vapors, could result in a fuel tank explosion and

consequent loss of the airplane .. I

DATES: We must receive cOnln;1entson this proposed AD by [INSERT DATE 45

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DAYS AFTER DATE OF PUBLICA nON [N THE FEDERAL REGISTER].